J/PASJ/76/293ivo://CDS.VizieR/J/PASJ/76/293doi:10.26093/cds/vizier/bj-2c-95CDSMuraoka K.Kojiguchi N.Ito J.Nogami D.Kato T.Tampo Y.Taguchi K.,Isogai K.Arranz T.Blackwell J.Blane D.Brincat S.M.Coates G.,Cooney W.Dvorak S.Galdies C.Glomski D.Hambsch F.-J.Harris B.,Hodge J.Hernandez-verdejo J.L.Iozzi M.Itoh H.Kiyota S.Lee D.,Larsson M.Lahtinen T.Myers G.Monard B.Morales Aimar M.,Moriyama M.Mizutani M.Nagai K.Alqaissieh T.Gabuya A.B.Odeh M.,Perello C.Pearce A.Perales J.M.Quiles D.Romanov F.D.Lane D.J.,Richmond M.Ruocco N.Sano Y.Spearman M.Schmidt R.Vanmunster T.,Dubovsky P.A.Wagner R.Wollenhaupt G.Lorenz J.Lehmann G.,Salewski A.Williamson G.2026-03-17T20:06:05Z2024-09-03T14:07:27ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frnovaephotometryvisible-astronomyWe present our optical photometric observations of the 2022 eruption of the recurrent nova U Scorpii (U Sco) using 49152 data points over 70d following the optical peak. We have also analyzed its soft X-ray (0.3-1keV) light curve by the Neil Gehrels Swift Observatory. During the 2022 eruption, the optical plateau stage started 13.8-15.0d and ended 23.8-25.0d after the optical peak. The soft X-ray stage started 14.6-15.3d and ended 38.7-39.5d after the optical peak. Both stages started later and had shorter durations, and the soft X-ray light curve peaked earlier and was less luminous compared to those during the U Sco 2010 eruption. These points suggest that there were differences in the envelope mass between the different cycles of the nova eruption. Furthermore, we have analyzed the optical eclipses during the 2022 eruption. The primary eclipse was first observed 10.4-11.6d after the optical peak, earlier than the beginning of the optical plateau stage. This sequence of events can be explained by the receding ejecta photosphere associated with the expanding nova ejecta. We have determined the ingress and egress phases of the primary eclipses and estimated the outer radius of the optical light source centered at the white dwarf (WD). During the optical plateau stage, the source radius remained ~1.2 times larger than the Roche volume radius of the primary WD, being close to the L1 point. When the optical plateau stage ended, the source radius drastically shrank to the tidal truncation radius within a few orbital periods. This previously unresolved phenomenon can be interpreted as a structural change in U Sco where the temporarily expanded accretion disk due to the nova wind returned to a steady state.2024PASJ...76..293Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASJ/76/293CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/140/925 : Pre-eruption light curves for Nova U Sco (Schaefer+, 2010)J/ApJ/742/112 : All quiescent magnitudes for CI Aql and U Sco (Schaefer, 2011)J/ApJ/742/113 : Photometry during the 2010 eruption of U Sco (Schaefer+, 2011)J/A+A/559/A121 : U Sco outburst & pre-outburst optical spectrum (Anupama, 2014)J/ApJ/811/32 : BVRcIcJHK and X-ray LCs of the U Sco nova (Pagnotta+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASJ/76/293https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASJ/76/293http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASJ/76/293https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASJ/76/293https://vizier.iucaa.in/viz-bin/votable?-source=J/PASJ/76/293http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASJ/76/293GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/PASJ/76/293/tablee1List of observers and instruments for optical photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCodeCodemeta.codecharprimaryObsObserver (Observatory)/Telescope & CCDmeta.notecharJ/PASJ/76/293/tablee2Log of optical photometry of the U Sco 2022 eruptionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDStarStar barycentric Julian date (TT) (BJD-2400000)dtime.epochdoubleBJDEndEnd barycentric Julian date (TT) (BJD-2400000)dtime.epochdoublemagMean magnitudemagphot.magfloate_magStandard deviation of the magnitudemagstat.error;phot.magfloatNObsNumber of observationsmeta.numberintCodeObserver's code (in tablee1.dat)meta.codecharJ/PASJ/76/293/tablee3Log of soft X-ray photometry of the U Sco 2022 eruptionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDObservation IDmeta.id;obsStartStar date (UTC)stime.epochnullableExpTimeExposure timestime.duration;obs.exposuredoubleJ/PASJ/76/293/tablee4Log of soft X-ray photometry of the 2010 eruptionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDObservation IDmeta.id;obsStartStar date (UTC)stime.epochnullableExpTimeExposure timestime.duration;obs.exposuredouble